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Influence of soft rock-fill material as dam embankment with central bituminous concrete membrane

Peter TSCHERNUTTER

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 1,   Pages 63-70 doi: 10.1007/s11709-010-0016-3

Abstract: This paper demonstrates the difficulties in determining the relevant material parameters for a valuation of the deformation behavior of the up- and downstream dam shell by means of an embankment dam of medium height. Laboratory as well as field tests on solid rock-fill material were performed before the beginning of construction. During the construction the properties of the available rock-fill changed from solid to soft materials. This gave rise to the necessity of adjusting the dam design of the downstream dam shoulder. Several times higher dam settlements as well as significant differential settlements between the up- and downstream dam shell were observed during construction and operation. Apart from this situation, the dam has been operated for nearly 20 years and the behavior of the water barrier has been very good.

Keywords： embankment dam     bituminous concrete membrane     rock-fill material properties     deformation behavior    

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A study on quality evaluation for bituminous mixture using X-ray CT

Satoshi TANIGUCHI, Keiichiro OGAWA, Jun OTANI, Itaru NISHIZAKI

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 2,   Pages 89-101 doi: 10.1007/s11709-013-0197-7

Abstract: The objective of this paper is to propose a new quality evaluation method for asphalt concrete mixture

Keywords： asphalt concrete mixture     aggregate     bitumen     bitumen content     quality evaluation     X-ray CT    

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Effect of temperature on Lu’an bituminous char structure evolution in pyrolysis and combustion

Yandi ZHANG, Yinhe LIU, Xiaoli DUAN, Yao ZHOU, Xiaoqian LIU, Shijin XU

Frontiers in Energy 2021, Volume 15, Issue 1,   Pages 14-25 doi: 10.1007/s11708-020-0805-x

Abstract: Lu’an bituminous char and ash samples were prepared at the N and air atmospheres respectively across

Keywords： bituminous char     pyrolysis     ash     structure evolution     reactivity    

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Investigation of effects of Cocamide Diethanolamide chemical on physical and rheological properties of bituminous

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 1,   Pages 99-116 doi: 10.1007/s11709-021-0799-4

Abstract: In this study, bituminous binder was modified with Cocamide Diethanolamide chemical, a non-ionic surfactantIn addition, Cocamide Diethanolamide has been used for the first time to modify bituminous binder, andBituminous binder was modified more than once with the chemical by changing modification parameters andThe examinations showed that Cocamide Diethanolamide softens bituminous binder and lowers processingIn addition, compared to reference binder, rutting resistances of modified bituminous binders decreased

Keywords： Cocamide Diethanolamide     bitumen modification     rheology     Superpave tests    

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Numerical simulation of combustion characteristics at different coal concentrations in bituminous coal

Chunlong LIU, Qunyi ZHU, Zhengqi LI, Qiudong ZONG, Yiquan XIE, Lingyan ZENG

Frontiers in Energy 2013, Volume 7, Issue 2,   Pages 255-262 doi: 10.1007/s11708-013-0255-9

Abstract: With the objective of producing a full-scale tiny-oil ignition burner, identical to the burner used in an 800 MWe utility boiler, numerical simulations were performed using Fluent 6.3.26 to study the progress of ignition for four coal concentration settings covering sub-operation conditions prevailing during the experiments performed with the burner. The numerical simulations conformed to the experimental results, demonstrating the suitability of the model used in the calculations. Simulations for a coal concentration of 0.40 kg/kg corresponding to a single burner operating at its rated output were also conducted, which indicated that gas temperatures along the burner centerline were high. As gas flowed to the burner nozzle, the high-temperature region expanded, ensuring a successful pulverized-coal ignition. With increasing coal concentration (0.08–0.40 kg/kg), the gas temperature along the burner centerline and at the first and second combustion chamber exits decreased at the equivalent radial points. At the center of the second combustion chamber exit, the O concentrations were almost depleted for the five coal concentrations, while the CO concentrations peaked.

Keywords： numerical simulation     tiny-oil ignition burner     pulverized coal     temperature field    

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Influence of different oil feed rate on bituminous coal ignition in a full-scale tiny-oil ignition burner

Chunlong LIU, Qunyi ZHU, Zhengqi LI, Qiudong ZONG, Xiang ZHANG, Zhichao CHEN

Frontiers in Energy 2013, Volume 7, Issue 3,   Pages 406-412 doi: 10.1007/s11708-013-0266-6

Abstract: experiments performed on a full-scale experimental setup, the influence of different oil flow rates on bituminous

Keywords： ignition     coal     burner     boiler     oil flow rate    

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Numerical simulation of bituminous coal combustion in a full-scale tiny-oil ignition burner: influence

Zhengqi LI, Chunlong LIU, Xiang ZHANG, Lingyan ZENG, Zhichao CHEN

Frontiers in Energy 2012, Volume 6, Issue 3,   Pages 296-303 doi: 10.1007/s11708-012-0191-0

Abstract: The progression of ignition was numerically simulated with the aim of realizing a full-scale tiny-oil ignition burner that is identical to the burner used in an 800 MWe utility boiler. The numerical simulations were conducted for four excess air ratios, 0.56, 0.75, 0.98 and 1.14 (corresponding to primary air velocities of 17, 23, 30 and 35 m/s, respectively), which were chosen because they had been used previously in practical experiments. The numerical simulations agreed well with the experimental results, which demonstrate the suitability of the model used in the calculations. The gas temperatures were high along the center line of the burner for the four excess air ratios. The flame spread to the burner wall and the high-temperature region was enlarged in the radial direction along the primary air flow direction. The O concentrations for the four excess air ratios were 0.5%, 1.1%, 0.9% and 3.0% at the exit of the second combustion chamber. The CO peak concentration was very high with values of 7.9%, 9.9%, 11.3% and 10.6% for the four excess air ratios at the exit of the second combustion chamber.

Keywords： numerical simulation     tiny-oil ignition burner     pulverized coal     temperature field    

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nominal maximum aggregate sizes in the bending beam rheometer on the prediction of thermal properties of bituminous

Chun-Hsing HO,María Francisca Martínez GONZÁLEZ,Cristina Pilar Martín LINARES

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 1,   Pages 1-7 doi: 10.1007/s11709-016-0367-5

Abstract: The objective of this research is to evaluate an impact of asphalt mixture beams with varying sizes of aggregate in the Bending Beam Rheometer (BBR) for testing/predicting thermal cracking properties of asphalt pavements. The BBR test has following benefits: the equipment is cheaper, it uses smaller specimens, faster conditioning, easier availability for quality control, easier to manage, etc. However some concerns have been raised: some consider that the size of the aggregate may affect the test’s results; the other concern is that such small beams cannot represent the whole properties of the asphalt pavement. To address these criticisms, imaging techniques, statistical analysis, and viscoelastic modeling are used. Asphalt thin beams prepared with three different nominal maximum aggregate size (NMAS) (12.5mm, 9.5 mm, and 4.75 mm) were tested at three different temperatures (-18°C, -24°C, and -30°C). Based on results from statistical analyses and viscoelasticity, the ratio of asphalt binders and voids and stiffness differences among the three NMAS specimens are not significant, meaning that the impact of asphalt thin beams prepared with the three NMAS on the prediction of thermal cracking is minimal and can be neglected.

Keywords： bending beam rheometer     thin beams     thermal cracking    

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Membrane fouling control by ultrasound in an anaerobic membrane bioreactor

SUI Pengzhe, WEN Xianghua, HUANG Xia

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 3,   Pages 362-367 doi: 10.1007/s11783-007-0062-9

Abstract: In this study, ultrasound was used to control the membrane fouling online in an anaerobic membrane bioreactorThe experimental results indicated that when the crossflow velocity was more than 1.0 m/s, membrane foulingWhen ultrasound was applied, an ultrasonic power range of 60–150 W was suitable for the membrane foulingThe experimental results showed that the membrane fouling was controlled so well that membrane filtration

Keywords： membrane filtration     filtration resistance     different     feasible ultrasonic     anaerobic membrane    

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Novel membrane separation technologies and membrane processes

Yanying Wei, Gongping Liu, Jianquan Luo, Libo Li, Zhi Xu

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 4,   Pages 717-719 doi: 10.1007/s11705-021-2053-y

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A critical review on thermodynamic mechanisms of membrane fouling in membrane-based water treatment process

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 10, doi: 10.1007/s11783-023-1729-6

Abstract:

● Fundamentals of membrane fouling are comprehensively reviewed.

Keywords： Membrane fouling     Thermodynamic mechanism     XDLVO theory     Flory-Huggins theory     Fouling migration    

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A review on membrane distillation in process engineering: design and exergy equations, materials and

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 5,   Pages 592-613 doi: 10.1007/s11705-021-2105-3

Abstract: Further advances in the field of desalination can be provided by innovative processes such as membraneenhanced research activities and allowed a deeper understanding of mass and heat transport phenomena, membranewetting, polarization phenomena and have encouraged the use of materials particularly suitable for membraneThis work summarizes recent developments in the field of membrane distillation, studies for module lengthoptimization, commercial membrane modules developed, recent patents and advancement of membrane material

Keywords： membrane distillation     recent developments     heat and mass transfer     wetting     membrane material    

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Pilot plants of membrane technology in industry: Challenges and key learnings

Colin A. Scholes

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 3,   Pages 305-316 doi: 10.1007/s11705-019-1860-x

Abstract: Membrane technology holds great potential in gas separation applications, especially carbon dioxide captureTo achieve this potential, the outputs from global research endeavours into membrane technologies mustbe trialled in industrial processes, which requires membrane-based pilot plants.These pilot plants are critical to the commercialization of membrane technology, be it as gas separationHere, the author reports on his experience of operating membrane-based pilot plants for gas separation

Keywords： membrane gas separation     membrane contactors     carbon capture     pilot plants     key learnings    

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Membrane bioreactors for hospital wastewater treatment: recent advancements in membranes and processes

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 5,   Pages 634-660 doi: 10.1007/s11705-021-2107-1

Abstract: In particular, membrane bioreactor (MBR) technology demonstrated high removal efficiency toward organicmicrofiltration) into the MBR units (hybrid MBRs) or the MBR as a pretreatment step and integrating other membraneprocesses as subsequent secondary purification step (integrated MBR-membrane systems).Then, an in-depth analysis was provided into the recent development of hybrid MBR and integrated MBR-membraneknowledge gaps in the field, highlighting the potential contribution of hybrid MBRs and integrated MBR-membrane

Keywords： membrane technology     membrane bioreactor     hospital wastewater     hybrid MBR     integrated MBR-membrane system    

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Highly hydrophobic oil−water separation membrane: reutilization of waste reverse osmosis membrane

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 10,   Pages 1606-1615 doi: 10.1007/s11705-022-2200-0

Abstract: In this work, the base nonwoven layer of the wasted reverse osmosis membrane was successfully modifiedinto the hydrophobic membrane via surface deposition strategy including TiO2 and 1H,1H,2HThe optimally modified membrane displayed good hydrophobicity with a contact angle of 135.2° ± 0.3°,This work might provide a new avenue for recycling the wasted reverse osmosis membrane used in oily wastewater

Keywords： oil–water separation     wasted reverse osmosis membrane     hydrophobic modification    

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Title Author Date Type Operation

Influence of soft rock-fill material as dam embankment with central bituminous concrete membrane

Peter TSCHERNUTTER

Journal Article

A study on quality evaluation for bituminous mixture using X-ray CT

Satoshi TANIGUCHI, Keiichiro OGAWA, Jun OTANI, Itaru NISHIZAKI

Journal Article

Effect of temperature on Lu’an bituminous char structure evolution in pyrolysis and combustion

Yandi ZHANG, Yinhe LIU, Xiaoli DUAN, Yao ZHOU, Xiaoqian LIU, Shijin XU

Journal Article

Investigation of effects of Cocamide Diethanolamide chemical on physical and rheological properties of bituminous

Journal Article

Numerical simulation of combustion characteristics at different coal concentrations in bituminous coal

Chunlong LIU, Qunyi ZHU, Zhengqi LI, Qiudong ZONG, Yiquan XIE, Lingyan ZENG

Journal Article

Influence of different oil feed rate on bituminous coal ignition in a full-scale tiny-oil ignition burner

Chunlong LIU, Qunyi ZHU, Zhengqi LI, Qiudong ZONG, Xiang ZHANG, Zhichao CHEN

Journal Article

Numerical simulation of bituminous coal combustion in a full-scale tiny-oil ignition burner: influence

Zhengqi LI, Chunlong LIU, Xiang ZHANG, Lingyan ZENG, Zhichao CHEN

Journal Article

nominal maximum aggregate sizes in the bending beam rheometer on the prediction of thermal properties of bituminous

Chun-Hsing HO,María Francisca Martínez GONZÁLEZ,Cristina Pilar Martín LINARES

Journal Article

Membrane fouling control by ultrasound in an anaerobic membrane bioreactor

SUI Pengzhe, WEN Xianghua, HUANG Xia

Journal Article

Novel membrane separation technologies and membrane processes

Yanying Wei, Gongping Liu, Jianquan Luo, Libo Li, Zhi Xu

Journal Article

A critical review on thermodynamic mechanisms of membrane fouling in membrane-based water treatment process

Journal Article

A review on membrane distillation in process engineering: design and exergy equations, materials and

Journal Article

Pilot plants of membrane technology in industry: Challenges and key learnings

Colin A. Scholes

Journal Article

Membrane bioreactors for hospital wastewater treatment: recent advancements in membranes and processes

Journal Article

Highly hydrophobic oil−water separation membrane: reutilization of waste reverse osmosis membrane

Journal Article